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[2]

It follows also that pleasure is not a form of motion.1 For every motion or process of change
involves duration, and is a means to an end, for
instance the process of building a house; and it is perfect when it has effected its end.
Hence a motion is perfect either when viewed over the whole time of its duration, or at
the moment when its end has been achieved. The several motions occupying portions of the
time of the whole are imperfect, and different in kind from the whole and from each other.
For instance, in building a temple the fitting together of the stones is a different
process from the fluting of a column, and both are different from the construction of the
temple as a whole; and whereas the building of the temple is a perfect process, for
nothing more is required to achieve the end proposed, laying the foundation and
constructing the triglyphs are imperfect processes, since each produces only a part of the
design; they are therefore specifically different from the construction of the whole, and
it is not possible to lay one's finger on a motion specifically perfect at any moment of
the process of building, but only, if at all, in the whole of its duration.

1κίνησις here has its wider sense of any process of
change that actualizes what is potentially; it includes generation, of which building is
an instance. In its proper sense κίνησις is limited to
change of quality, quantity, or place.